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In this work, we demonstrate a freeform metasurface with novel birefringent properties. Traditionally, birefringence is considered as an intrinsic material property and its behavior typically limited to what is known as linear birefringence. In this work, by using a photonic inverse design approach...

In this recently published work, we show that, by engineering the dispersion of each constituent nanostructure, a metalens can possess two different focal lengths with customized focal length shifts. The focal length shift can be designed with achromatic, refractive, or diffractive...

We demonstrated that a single semiconductor laser can produce both an amplitude-modulated and a frequency-modulated frequency comb, revealing a physical relationship between two types of output previously thought to be independent. The physics of the frequency combs is illustrated by an analogy with systems of...

Metalenses are flat lenses that are ultrathin and lightweight, and are typically realized by placing millions to billions of nano-structures on a surface. The large number of structures makes scalability in both size and production scale a major concern. In our recent work, we demonstrate mass-...

We recently demonstrated a molecular gas laser that emits at frequencies between 250 GHz up to almost 1 THz using nitrous oxide (commonly known as laughing gas) as the gain medium. This laser relies on the optical pumping of the gas by a quantum cascade laser and can be generalized to a large number...